Only legal move mates

I have been following the general discussion regarding some of the draws that Lichess doesn't pickup because of the way material reacts. So I have decided to be provocative and pose two cases where the only possible series of legal moves results in mate. So 1. What is the general feeling regarding the implementation of such of these cases not just according to Lichess but also Fide? 2. Does anyone have better examples than the ones I have made because I am quite getting into chess compositions and was wondering if this was a genre I had developed?

<iframe width=600 height=371 src="lichess.org/study/embed/7itbvLX5/0LmmzPhH" frameborder=0></iframe>

I was thinking especially @bufferunderrun would know some of these answers.

Thank you!

Something like this?

chess.stackexchange.com/questions/4963/longest-sequence-of-mutually-forced-moves

White isn't forced to take on a8 in your second example. Though, if you remove the rook and one of the black's queens, then it would be a draw according to FIDE rules. Since there are no legal sequence of moves that leads to a checkmate and white winning. Same goes for your first example.

As for Lichess, there are no reasonable ways for us to detect such positions. I'm not talking about these two that you provided, but in general. Pull requests are welcome, if you can come up with improvements.

PS: It's enough to just post a link, it will auto-embed.

@Sarg0n Yes this is what I am looking for except ending in a mate.

@bufferunderrun Thanks for the response. I completely missed that fact in my second composition haha

Also revised the previous more intricate example to work

This falls under the category of "any series of legal moves forces mate" It should kind of automatically become a win for black right?

There‘s no evidence that the player will see the possibility. Having time left, he still could offer draw or resign.

ahh

@Sarg0n this is precisely my point, you don't need time in these situations, the win is automated. The fide rules stipulate somehing like the guy left with time should win if there is a series of legal moves that allows it. In this case I want to argue that ALL series of legal moves end up in a victory for black and should black's time run out it becomes a tricky question of what to award as a result right?

Jan-Meyer - if Black's time runs out, clearly a draw. Moves are not completed until the clock is pressed. Black could make a series of illegal moves and so default the game. Black's phone could go off.

It's checkmate that ends the game, not forced checkmate.